After Killings, U.N. Stops Vaccine Work in Pakistan

Pakistani polio vaccination workers shout slogans against the killing of their colleagues during a protest in Karachi on December 19, 2012.
(Rizwan Tabassum/Getty)

Following the murders of two additional vaccine workers in Pakistan, the United Nations has announced that they will suspend the program. Declan Walsh has been following the story for The New York Times.